SU carb overfilling
Posted: Sun May 24, 2020 5:33 pm
Hi all.
I'm fitting an HIF44 to my 1275, in place of the HIF38. I have rebuilt it with new seals, jet needle, float chamber needle valve and seat.
The problem I have is that I can't stop the carb overfilling, despite following the Burlen website guide on setting the float height (1mm +-0.5 below the bowl rim measured in the centre of the float).
I have tried swapping the new needle valve for the old one, and it still overfills.
I am using a standard SU type L fuel pump which has given good service for over 20 years, and with the ignition on, it clicks away for several seconds, then clicks once every 15 seconds or so, until eventually it overflows out of the overflow pipe. I have had the float out and am happy that it is not leaking and filling with fuel.
Any ideas anyone? I daren't risk starting the engine if fuel is going to spill over a hot exhaust!
Cheers N
I'm fitting an HIF44 to my 1275, in place of the HIF38. I have rebuilt it with new seals, jet needle, float chamber needle valve and seat.
The problem I have is that I can't stop the carb overfilling, despite following the Burlen website guide on setting the float height (1mm +-0.5 below the bowl rim measured in the centre of the float).
I have tried swapping the new needle valve for the old one, and it still overfills.
I am using a standard SU type L fuel pump which has given good service for over 20 years, and with the ignition on, it clicks away for several seconds, then clicks once every 15 seconds or so, until eventually it overflows out of the overflow pipe. I have had the float out and am happy that it is not leaking and filling with fuel.
Any ideas anyone? I daren't risk starting the engine if fuel is going to spill over a hot exhaust!
Cheers N